*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
.buju{
    width: 1200px;
    margin: 0 auto;
}
.hz{
    float: left;
    width: 33.33333%;
    background: tan;
    line-height: 40px;
    text-align: center;
}
.hz:after{
    clear: both;
    content: "";
    display: table;
}
/*--响应式代码--*/
@media (max-width: 1000px) {
    .hz{
        width: 100%;
    }
    .buju{
        width: 100%;
    }
}